Do you mean you have a C major sequence loop and want to shift the notes into B major? The loop being played is not changed, right?
In this case, you are shiting the entire loop by a halfnote. You shouldn't use the diatonic algorithm. H910/949 or PitchFlex should do the work. Just set Pitch A to -m2 or 0.944.
If the loop itself changes its key to B major, and you'd like to add more pitches/delays to it, then you should use Diatonic/QuadraVox algorithm and set the KEY parameter to B and SCALE parameter to MAJOR.